RNC Unidirectional DCH Indicator for TFI TFCI Perception Alignment
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Solution Overview
Problem
In the 3GPP mobile communication system, when setting up a pair of channels for HS-DSCH and DCH, there is a discrepancy in perception between the Node B and the UE regarding the TFI and TFCI, leading to incorrect data decoding due to notification of unused downlink DCH information.
Innovation Solution
The RNC notifies the Node B to remove unused downlink DCH information from the TFI and TFCI construction targets using an 'Unidirectional DCH Indicator', ensuring accurate data decoding by matching perceptions between the network and the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of downlink and uplink DCHs are set up according to 3GPP specification, then the RLC AM function can be implemented for reliable data transmission, but the Node B and UE have discrepancy in perception of TFI and TFCI leading to incorrect data decoding
Solution Approach 1:
The patent extracts and removes the unused downlink DCH information from the TFI and TFCI construction targets at the Node B side. By selectively taking out only the necessary unidirectional DCH information and excluding the paired downlink DCH information that is not actually used, the perception discrepancy between Node B and UE is eliminated, allowing correct data decoding while maintaining RLC AM functionality
Solution Approach 2:
The patent segments the DCH information into two distinct parts: the unidirectional DCH information that is actually used for RLC AM, and the paired downlink DCH information that is not used. By separating these information segments and only notifying the Node B about the unidirectional portion, the system avoids the perception discrepancy while preserving the reliability benefits of RLC AM
2Adaptability or versatility
If paired DCH channels are established for HS-DSCH and uplink, then RLC AM can be executed between network and UE, but unnecessary downlink DCH information is notified to Node B causing perception mismatch
Solution Approach 1:
The patent extracts only the essential unidirectional DCH information required for RLC AM operation and transmits it to the Node B, while excluding the unnecessary paired downlink DCH information. This extraction approach maintains the adaptability to execute RLC AM while reducing the channel configuration complexity by eliminating redundant information notification
Data Source
AI summary
In a mobile communication system, the information on a downlink DCH actually not used is regarded as removable from the construction target of a TFI and a TFCI, so that a discrepancy of the perception regarding the TFI and the TFCI is not occurred between a base station and a UE (User Equipment). An indicator information in terms of an “Unidirectional DCH Indicator” is generated in an Indicator processing portion of a RNC so that the base station can remove the information regarding the downlink DCH actually not used from the construction target of the TFI and the TFCI, and the information, which is included in the NBAP message, is transmitted to the base station from the NBAP message composition portion. When, at the NBAP message analyzing portion of the base station, it is determined that the “Unidirectional DCH Indicator” is included in this message, the information regarding the downlink DCH actually not used in a TFCI construction portion is removed from the construction target of the TFI and the TFCI.